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Old October 5th, 2020, 10:17 PM   #1
gitter
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Question Motor frozen....ish. I have questions

So I picked up a 95 ex250 with under 3k miles on it. Previous owner said the motor was completely locked up. Finally got some time to tinker with it. Pulled the cam chain tensioner and that allowed me to slowly rotate the motor by hand. If I put the cct back in, I can no longer rotate anything.

So my current question...where do I go from here?

Thanks

Joel
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Old October 6th, 2020, 06:05 AM   #2
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Pull the valve cover and take a look at the valvetrain. A rocker may have broken and is jamming the cam or gears.

If you can spin the engine with the cam chain disengaged it would suggest the bottom end is not the problem - which is good news.

When you start to put things back together you will need to make sure the cams are in the right place because you have changed their relationship to the crank by turning the engine over with the chain not engaged.

This thread may help - https://faq.ninja250.org/wiki/What_i...t_procedure%3F
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Old October 6th, 2020, 08:22 AM   #3
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Awesome thanks, so I have the valve cover off and checked to make sure none of the rockers jumped ship before I pulled the CCT. So at this point do I just check the valves while Iím in there and then make sure the cams are in the right spot?
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Old October 6th, 2020, 09:20 AM   #4
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Yeah, verify valve-clearances and cam-timing.

I've seen gummed up dried petrol seize up intake-valve stems.
Although that doesn't make engine difficult to turn.
Try following:

- spray PB-Blaster onto intake-valve-stems through intake-port
- spray PB-Blaster into cylinders through spark-plug holes
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Old October 6th, 2020, 06:29 PM   #5
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MOTM - Jun '18, Oct '16
Check the cam timing and reinstall the tensioner, then try to turn it over while watching the cam and valves to see if you can find a problem.

If the cams had gotten out of time it's possible the piston was hitting an open valve and stopping the rotation.
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Old November 15th, 2020, 12:41 PM   #6
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Quick Update:

I soaked everything I could in PB-blaster a few times and then retimed the cams which were waaaay out, I'm not sure how or why.

Currently I can turn the motor slowly by hand with the CCT installed, which is progress. Haven't had time to check valve clearances yet, but I assume that would be prudent before I put things back together.

What would be the best way to check the valves to see if any of them were damaged by either the previous owner or myself attempting to turn the motor by hand with the timing being as far off as it was?
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Old November 15th, 2020, 01:07 PM   #7
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MOTY - 2018, MOTM - Nov '17
Manual says to put engine at 2T for cam-timing.
Whoever did that engine last probably used different mark.

Compression or leak-down test would reveal if you've got valve-sealing issues.

Last futzed with by DannoXYZ; November 15th, 2020 at 02:14 PM.
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Old November 16th, 2020, 10:08 AM   #8
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Iím surprised anyone was inside the motor under 3k on the clock but that makes sense. I canít think of any other reason the timing would be that far out
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Old November 20th, 2020, 10:56 PM   #9
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just finished up the valves. Adjusted them to the loose side of in spec. Anything else I should check / take care of before I button everything back up and move on to the carbs? Also, should I coat the cams with a little more oil before I put the valve cover back on?
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Old November 21st, 2020, 06:31 AM   #10
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Obviously you won't damage the cams by oiling them.
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Old Today, 12:43 PM   #11
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When cams have been removed or during a rebuild. You should use a 50/50 engine oil & grease mixed together into a thick oil/thin grease ! Apply to journals & lobes.
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